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drm/vmwgfx: Enable DMA mappings with SEV 

Enable DMA mappings in vmwgfx after TTM has been fixed in commit
3bf3710e37 ("drm/ttm: Add a generic TTM memcpy move for page-based iomem")

This enables full guest-backed memory support and in particular allows
usage of screen targets as the presentation mechanism.

Signed-off-by: Zack Rusin <zack.rusin@broadcom.com>
Reported-by: Ye Li <ye.li@broadcom.com>
Tested-by: Ye Li <ye.li@broadcom.com>
Fixes: 3b0d6458c7 ("drm/vmwgfx: Refuse DMA operation when SEV encryption is active")
Cc: Broadcom internal kernel review list <bcm-kernel-feedback-list@broadcom.com>
Cc: dri-devel@lists.freedesktop.org
Cc: <stable@vger.kernel.org> # v6.6+
Reviewed-by: Martin Krastev <martin.krastev@broadcom.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240408022802.358641-1-zack.rusin@broadcom.com
This commit is contained in:
Zack Rusin 2024-04-07 22:28:02 -04:00
parent 3eadd887db
commit 4c08f01934
1 changed files with 6 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
View File

@ -666,11 +666,12 @@ static int vmw_dma_select_mode(struct vmw_private *dev_priv)
[vmw_dma_map_populate] = "Caching DMA mappings.",
[vmw_dma_map_bind] = "Giving up DMA mappings early."};
/* TTM currently doesn't fully support SEV encryption. */
if (cc_platform_has(CC_ATTR_MEM_ENCRYPT))
return -EINVAL;
if (vmw_force_coherent)
/*
* When running with SEV we always want dma mappings, because
* otherwise ttm tt pool pages will bounce through swiotlb running
* out of available space.
*/
if (vmw_force_coherent || cc_platform_has(CC_ATTR_MEM_ENCRYPT))
dev_priv->map_mode = vmw_dma_alloc_coherent;
else if (vmw_restrict_iommu)
dev_priv->map_mode = vmw_dma_map_bind;